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The difference between homopolymer polypropylene and copolymer polypropylene

The difference between homopolymer polypropylene and copolymer polypropylene

(Summary description)Polymerized from a single propylene monomer, it has the lowest density among common plastics, and its molecular chain regularity is very high, so the material has high crystallinity and poor impact performance.

The difference between homopolymer polypropylene and copolymer polypropylene

(Summary description)Polymerized from a single propylene monomer, it has the lowest density among common plastics, and its molecular chain regularity is very high, so the material has high crystallinity and poor impact performance.

Information

1 PP-H
Polymerized from a single propylene monomer, it has the lowest density among common plastics, and its molecular chain regularity is very high, so the material has high crystallinity and poor impact performance.
Advantages: good strength, good corrosion resistance.
Disadvantages: poor impact resistance (brittle), poor toughness, poor dimensional stability, easy aging, poor long-term heat resistance and stability, and poor barrier properties to gases such as oxygen and carbon dioxide.
Uses: It can be used for packing belts, bottle blowing, brushes, wrapping paper films, etc.
Distinguishing method: the wire is flat and not long when pulled by fire.

Polypropylene Homopolymer

2 PP-B
It is obtained by copolymerization of propylene and part of ethylene, and the ethylene content is generally 7-15%. However, since the probability of two ethylene monomers and three monomers being connected together in PP-B is very high, it means that only embedded ethylene monomers exist. In the segment phase, the regularity of PP-H is not reduced, so the purpose of improving the performance of PP-H melting point, long-term hydrostatic pressure resistance, long-term heat resistance and pipe processing and molding cannot be achieved.
Advantages: better impact resistance.
Disadvantages: low transparency, low gloss, poor moisture absorption resistance, acid and alkali corrosion resistance, solubility resistance and oxidation resistance at high temperatures.
Uses: For bumpers, thin-walled products, strollers, sports equipment, luggage, paint buckets, battery boxes, thin-walled products.
Identification method: It does not turn black after being ignited, and can pull out a very long round wire.
 

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Time of issue:2022-08-06 11:27:16

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